Description of cases defined by ‘serology strict’ and association with bivariable and multivariable analyses based on Mat-O-Covid index (continuous and categorised)
| Total | No of cases | Proportion (%) | Crude ORs (95% CI) | Adjusted ORs*, Mat-O-Covid index continuous (95% CI) | Adjusted ORs*, Mat-O-Covid index categorised(95% CI | |
| Sex | ||||||
| Men | 6804 | 377 | 5.54 | 1 | 1 | 1 |
| Women | 7758 | 534 | 6.88 | 1.26 (1.10 to 1.44) | 1.21 (1.02 to 1.43) | 1.21 (1.02 to 1.43) |
| Age | ||||||
| <30 years | 338 | 12 | 3.55 | 0.45 (0.25 to 0.81) | 0.47 (0.24 to 0.93) | 0.46 (0.23 to 0.91) |
| 30–40 years | 3499 | 304 | 8.69 | 1.17 (1.00 to 1.36) | 1.14 (0.95 to 1.37) | 1.13 (0.94 to 1.36) |
| 40–50 years | 5332 | 402 | 7.54 | 1 | 1 | 1 |
| 50–60 years | 4323 | 154 | 3.56 | 0.45 (0.37 to 0.55) | 0.43 (0.34 to 0.54) | 0.43 (0.34 to 0.54) |
| ≥60 years | 1070 | 39 | 3.64 | 0.46 (0.33 to 0.65) | 0.43 (0.28 to 0.66) | 0.44 (0.28 to 0.67) |
| Family meeting | ||||||
| No | 499 | 18 | 3.61 | 0.55 (0.34 to 0.88) | 0.48 (0.25 to 0.90) | 0.48 (0.25 to 0.91) |
| Yes, one time | 955 | 57 | 5.97 | 0.93 (0.70 to 1.23) | 1.09 (0.78 to 1.52) | 1.10 (0.79 to 1.53) |
| Yes, more than one time | 13 062 | 835 | 6.39 | 1 | 1 | 1 |
| Leisure activities | ||||||
| No | 3401 | 195 | 5.73 | 0.89 (0.75 to 1.05) | 0.98 (0.80 to 1.20) | 0.98 (0.80 to 1.21) |
| Yes, one time | 841 | 55 | 6.54 | 1.02 (0.77 to 1.36) | 1.22 (0.87 to 1.71) | 1.22 (0.87 to 1.72) |
| Yes, more than one time | 10 271 | 659 | 6.42 | 1 | 1 | 1 |
| Regular shopping | ||||||
| No | 285 | 16 | 5.61 | 0.88 (0.53 to 1.47) | 0.88 (0.47 to 1.64) | 0.88 (0.47 to 1.64) |
| Yes, one time | 197 | 8 | 4.06 | 0.63 (0.31 to 1.28) | 0.75 (0.35 to 1.62) | 0.75 (0.35 to 1.63) |
| Yes, more than one time | 14 027 | 885 | 6.31 | 1 | 1 | 1 |
| Public places visit | ||||||
| No | 2260 | 113 | 5 | 0.74 (0.61 to 0.91) | 0.86 (0.67 to 1.11) | 0.87 (0.68 to 1.11) |
| Yes, one time | 1950 | 114 | 5.85 | 0.88 (0.71 to 1.08) | 0.80 (0.62 to 1.03) | 0.80 (0.62 to 1.03) |
| Yes, more than one time | 10 311 | 682 | 6.61 | 1 | 1 | 1 |
| Use o f hand sanitiser† | ||||||
| No | 280 | 18 | 6.43 | 0.96 (0.59 to 1.56) | 0.94 (0.50 to 1.75) | 0.94 (0.50 to 1.76) |
| Yes, after almost every outing | 4710 | 254 | 5.39 | 0.80 (0.69 to 0.93) | 0.79 (0.66 to 0.95) | 0.79 (0.66 to 0.95) |
| Yes, systematically after each outing (or I never go out) | 9537 | 637 | 6.68 | 1 | 1 | 1 |
| Wearing mask† | ||||||
| No | 381 | 21 | 5.51 | 0.97 (0.61 to 1.54) | 0.94 (0.54 to 1.64) | 0.94 (0.54 to 1.65) |
| Yes, after almost every outing | 10 636 | 690 | 6.49 | 1.15 (0.98 to 1.36) | 1.20 (0.98 to 1.47) | 1.20 (0.98 to 1.47) |
| Yes, systematically after each outing (or I never go out) | 3507 | 199 | 5.67 | 1 | 1 | 1 |
| Difference between questionnaire and serology | ||||||
| Less than 3 months | 2346 | 199 | 8.48 | 1 | 1 | 1 |
| 3 months or more | 12 216 | 712 | 5.83 | 0.67 (0.57 to 0.79) | 0.65 (0.54 to 0.79) | 0.65 (0.54 to 0.79) |
| Mat-O-Covid Index | ||||||
| Continuous variable | 14 562 | 911 | 6.26 | 1.01 (1.00 to 1.02) | 1.01 (1.00 to 1.02) | |
| <13 per thousand | 8984 | 560 | 6.23 | 1 | 1 | |
| ≥13 per thousand | 1227 | 103 | 8.39 | 1.38 (1.11 to 1.72) | 1.30 (1.03 to 1.63) |
Bold results: overall test, p <0.05.
*Adjusted for sex, age, family meeting, leisure activities, regular shopping, public places visit, use of hand sanitiser, wearing mask and time between questionnaires.
†Outside of work.